“…In Dragon-1 and Dragon-2, the focus was on DEM generation and surface motion estimation with medium resolution Synthetic Aperture Radar (SAR) data. Since Dragon-3, SAR datasets of high spatial and temporal resolution (TerraSAR-X, COSMO-SkyMed) were made available, and nowadays, thanks to the availability of dense time series from Sentinel-1, accurate and frequent global coverage has become a reality [1][2][3][4][5]. Moreover, the capabilities of SAR-based Earth Observation are on their way for a further improvement in the very near future, thanks to new low-frequency Missions, such as BIOMASS and ROSE-L, that will grant enhanced wave penetration in natural media, such as forests and ice [6,7].…”